Production of singlet P-wave cc and bb states

Publication

Publication

No spin-singlet bb quarkonium state has yet been observed. In this paper we discuss the production of the singlet P-wave bb and cc
1P
1 states h
b and h
c. We consider two possibilities. In the first the
1P
1 states are produced via the electromagnetic cascades Y(3S)→ν
b(2S) + γ→h
b + γγ→ν
b + γγγ and ψ′→ν
c′ + γ→h
c + γγ→ν
c + γγγ. Amore promising process consists of single pion transition to the
1P
1 state followed by the radiative transition to the 1
1S
0 state: Y(3S)→h
b + π
0→ν
b + π
0 + γ and ψ′→h
c + π
0→ν
c + π
0 + γ. For a million Y(3S) or ψ′'s produced we expect these processes to produce several hundred events.